Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 37°F. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
17th Dec
37

32

6

2
Thursday
18th Dec
48

23

0

0
Friday
19th Dec
28

18

6

2
Saturday
20th Dec
41

28

7

2
Sunday
21st Dec
36

28

4

2

5-day weather forecast updated at 04:01 on Wednesday 17th December 2025 GMT

More about Decatur

Decatur by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Illinois

TUI: up to 7% off holidays booked online

Sale

Book online with TUI & save up to 7% on holidays
FREE child places available for select holidays
Pay £0 deposits with direct debit & spread the cost

Go to TUI deal >>

View all TUI offers

TUI deal finder

Destination

The 5-day weather forecast for Illinois (Decatur) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Decatur weather forecast by day

Below are the detailed weather forecasts for Decatur for the next 5 days.

Decatur weather for Wednesday 17th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 37°F, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 15 mph from the south-east.

37
°F maximum temperature
32
°F minimum temperature
broken clouds
6
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
30
°F wind chill
15
mph wind from SE

Decatur weather for Thursday 18th December 2025

Expect overcast with light rain in Decatur, Illinois with a maximum temperature of 48°F and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 22 mph from the west.

48
°F maximum temperature
23
°F minimum temperature
overcast with light rain
0
hours of sunshine
0
UV index (None)
99
% chance of some rain
<10
mm of rainfall expected
41
°F wind chill
22
mph wind from W

Decatur weather for Friday 19th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 28°F, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 22 mph from the west.

28
°F maximum temperature
18
°F minimum temperature
broken clouds
6
hours of sunshine
2
UV index (Low)
0
cm of snow expected
14
°F wind chill
22
mph wind from W

Decatur weather for Saturday 20th December 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 41°F, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 17 mph from the south.

41
°F maximum temperature
28
°F minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
32
°F wind chill
17
mph wind from S

Decatur weather for Sunday 21st December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 36°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north.